 |
 |
 |
 |
|
 |
 |
SAE J2735-Draft-Rev26 [issued: 09-18-08]
-
11 -
This is an SAE Motor Vehicle Council draft document of the DSRC committee, subject to change.
3. Terms and definitions
For the purposes of this standard, the following definitions, abbreviations and acronyms apply.
3.1 Definitions
For the purposes of this standard, the following definitions shall apply.
3.1 actuated operation: A type of traffic control signal operation in which some or all signal phases are
operated on the basis of actuation, e.g. detector inputs. A signal without any actuation runs on either fixed
time or time of day operation. A signal may be semi-actuated as well.
3.2 airlink: A radio frequency communication interface, such as that defined by WAVE.
3.3 application class identifier (ACID): A code that identifies a class of application, as defined by the
IEEE.
3.4 application context mark (ACM): A code identifying a specific instance of an application (as defined
in IEEE documents).
3.5 application-specific data dictionary: A data dictionary specific to a particular implementation of an
ITS application. Local deployments which use DSRC (or other message sets) may often select a subset of
the defined messages meeting their specific needs and create an application-specific data dictionary for that
deployment.
3.6 approach: All lanes of traffic moving towards an intersection or a midblock location from one
direction, including any adjacent parking lane(s). In the context of this standard an approach is a arbitrary
collection of lanes used in the flow of traffic preceding to an intersection or a midblock location. An
approach is typically identified by its general flow, i.e. “the east-bound approach”. In this standard an
approach consists of one or more motor vehicle lanes of travel as well as possible pedestrian lanes, parking
lanes, barriers, and other types of lane objects some of which cross the path of the motor vehicle travel.
3.7 byte type encoding: A type of information encoding where units of information are handled in modular
increments of 8 bits.
3.8 computed lane: A computed lane is a lane drivable by motorized vehicle traffic which shares its path
definition with another nearby lane at the same intersection. It is one of several types of basic lanes defined
in the message set. The computed lane allows saving of message bytes used to express the geometric path
of multiple lanes approaching an intersection from the same direction.
3.9 conflict monitor: A device used to detect and respond to improper or conflicting signal indications and
improper operating voltages in a traffic controller assembly.
3.10 control channel (CCH): The radio channel of those defined in IEEE 802.11p used for exchange of
management data and WAVE Short Messages.
 |